Mount Everest's Trash-Covered Slopes Are Being Cleaned By Drones
Human waste, empty oxygen cylinders, kitchen leftovers and discarded ladders.
Sherpas working on Mount Everest carry all that and more — 20 kilograms (44 pounds) per person — navigating a four-hour hike that traverses crumbling glacial ice and treacherous crevasses to bring trash back to base camp.